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If I expand $25\cdot 24\cdot 23 \cdots 3 \cdot 2 \cdot 1$, how many zeros are there at the end of the number I get?

 Feb 10, 2021
 #1
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+1

25/5  =   5 zeroes

25/5^2 =  25/25  = 1  more zero

 

So

 

5 +  1    =  6 zeroes

 

 

cool cool cool 

 Feb 10, 2021

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